Sent in by Dude Man at The Unofficial World of Nintendo!!!
On the level Heli-Crash or something like that, to get the secret vehicle
make sure you have turbo. When you are going up the steep hill to get
the checkpoint where the car turns around and you go the way you came,
use a turbo and make sure you have a 4x4. You will break the wall away
at the top and the secret car will be there. This car is the super van.
On the level cold fusion use a 4x4 and turn around at the starting. on the
right there should be two snowball things. Break them away and drive
against the left side until the wall breaks away. Drive into there there
should be a car in there.